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dc.contributor.authorReichenheim, Michael
dc.contributor.authorSouza, Wanderson
dc.contributor.authorFreire Coutinho, Evandro Silva
dc.contributor.authorFigueira, Ivan
dc.contributor.authorQuintana, Maria Inês [UNIFESP]
dc.contributor.authorMello, Marcelo Feijó de [UNIFESP]
dc.contributor.authorBressan, Rodrigo Affonseca [UNIFESP]
dc.contributor.authorMari, Jair de Jesus [UNIFESP]
dc.contributor.authorAndreoli, Sergio Baxter [UNIFESP]
dc.identifier.citationPlos One. San Francisco: Public Library Science, v. 9, n. 4, 7 p., 2014.
dc.description.abstractBackground: Tonic Immobility is a temporary state of motor inhibition in situations involving extreme fear. the first scale developed for its assessment was the 10-item Tonic Immobility Scale (TIS). However, there are still few studies on its structural (dimensional) validity. the objective of this study was to reassess the factor structure of the TIS applied to representative samples exposed to general trauma of two Brazilian mega-cities.Methods: the sample comprised 3,223 participants reporting at least one traumatic experience. in São Paulo (n = 2,148), a Confirmatory Factor Analysis (CFA) first tested the originally proposed two-dimensional structure. This was followed by sequential Exploratory Structural Equation Models to identify the best fitting model, and subsequently tested in Rio de Janeiro (n = 1,075) via CFA. Alternative reduced versions were further explored using the aggregate sample. Model-based Item Response Theory (IRT) location parameters were also investigated.Results: An absence of factor-based convergent and discriminant validity rejected the original proposition. However, the one-dimensional structure still held several residual correlations. Further exploration indicated the sustainability of reduced versions with seven (alternative A) and six (alternative B) items. Both presented excellent fit and no relevant residual item correlation. According to the IRT location parameters, items in alternative B covered a wider range of the latent trait. the Loevinger's H scalability coefficients underscored this pattern.Conclusions: the original model did not hold. A one-factor solution was the most tenable in both large samples, but with significant item residual correlations, indicating that content redundancies persisted. Further reduced and simplified versions of the TIS proved promising. Although studies are yet to be carried out in other settings, it is the authors' impression that the restricted versions of the TIS are already apt for use in epidemiologic studies since the pros tend to outweigh the cons (as outlined in the Discussion section).en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.publisherPublic Library Science
dc.relation.ispartofPlos One
dc.rightsAcesso aberto
dc.titleStructural Validity of the Tonic Immobility Scale in a Population Exposed to Trauma: Evidence from Two Large Brazilian Samplesen
dc.contributor.institutionUniversidade do Estado do Rio de Janeiro (UERJ)
dc.contributor.institutionFed Rural Univ Rio de Janeiro UFRRJ
dc.contributor.institutionFiocruz MS
dc.contributor.institutionUniversidade Federal do Rio de Janeiro (UFRJ)
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.description.affiliationState Univ Rio de Janeiro UERJ, Dept Epidemiol, Inst Social Med IMS, Rio de Janeiro, RJ, Brazil
dc.description.affiliationFed Rural Univ Rio de Janeiro UFRRJ, Dept Psychol, Inst Educ, Seropedica, RJ, Brazil
dc.description.affiliationFiocruz MS, Dept Epidemiol, Natl Sch Publ Hlth ENSP, Rio de Janeiro, RJ, Brazil
dc.description.affiliationFed Univ Rio de Janeiro UFRJ, Inst Psychiat IPUB, Rio de Janeiro, RJ, Brazil
dc.description.affiliationFed Univ São Paulo UNIFESP, Dept Psychiat, São Paulo, Brazil
dc.description.affiliationUnifespFed Univ São Paulo UNIFESP, Dept Psychiat, São Paulo, Brazil
dc.description.sponsorshipIDFAPESP: 2004/15039-0
dc.description.sponsorshipIDCNPq: 420122/2005-2
dc.description.sponsorshipIDCNPq: 301221/2009-0
dc.description.sponsorshipIDCNPq: 06575/2011 6
dc.description.sourceWeb of Science
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